check_summary
bc = check_summary(osb, sp, daddr, debug, devvp, NULL);
int check_summary(struct lfs *, union segsum *, daddr_t, int, struct uvnode *, void (*)(daddr_t, union finfo *));
bc = check_summary(fs, sp, daddr, debug, devvp, NULL);
bc = check_summary(fs, sp, daddr, debug, devvp, pass6harvest);